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SEIS (UK)

Also called: seed enterprise investment scheme, SEIS

In one line

The UK's even more generous early-stage version of EIS, offering larger tax reliefs for investing in very young companies.

In plain English

SEIS targets the earliest startups, giving investors the biggest UK tax breaks for the highest-risk stage. Like EIS, it mostly shapes the investor side of the cap table.

If you were explaining it to a 5-year-old

An even bigger British tax reward for grown-ups who back the tiniest, newest clubs.

Why it matters when you sell

SEIS influences who invests at the earliest stage, shaping the cap table and investor base around your shares.

Related terms

EIS (UK)Seed roundPre-seed roundAccredited investor

Put it to use

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Sources

Primary references for this term: UK Government / HMRC (gov.uk). Our definitions are written in plain English and kept evergreen — see the glossary methodology. General information, not advice.

Educational information only — not financial, tax or legal advice, and not an offer to buy or sell any security. Definitions are general; your own documents and local law govern your situation. PrivateTechShares is independent and not a broker or marketplace.